| A | B | 
| ELECTROMAGNETIC WAVES | A disturbance that transfers energy through a field. | 
| RADIATION | The transfer of energy in the form of electromagnetic waves. | 
| ELECTROMAGNETIC SPECTRUM | The range of all EM frequencies. | 
| RADIO WAVES | EM waves with the longest wavelenghts and lowest frequencies. | 
| MICROWAVES | EM waves with shorter wavelenghts and higher frequencies than radio waves. | 
| VISIBLE LIGHT | Part of the EM spectrum that human eyes can see. | 
| INFRARED LIGHT | Part of the EM spectrum spectrum with frequencies between microwaves and visible light. | 
| ULTRAVIOLET LIGHT | Part of the EM spectrum with frequencies above visible light and below those of x rays. | 
| X RAYS | Part of the EM spectrum with very high frequencies. | 
| GAMMA RAYS | Part of the EM spectrum with the highest frequencies. |